Revised edition of the author's Research methods in psychology, [2015].

Introduction to scientific reasoning -- Psychology is a way of thinking -- Sources of information : why research is best and how to find it -- Three claims, four validities : interrogation tools for consumers of research -- Research foundations for any claim -- Ethical guidelines for psychology research -- Identifying good measurement -- Tools for evaluating frequency claims -- Surveys and observations : describing what people do -- Sampling : estimating the frequency of behaviors and beliefs -- Tools for evaluating association claims -- Bivariate correlational research -- Multivariate correlational research -- Tools for evaluating causal claims -- Introduction to simple experiments -- More on experiments : confounding and obscuring variables -- Experiments with more than one independent variable -- Balancing research priorities -- Quasi-experiments and small-n designs -- Replication, generalization, and the real world -- Appendix A: Random numbers and how to use them -- Appendix B: Statistical tables -- Glossary -- References.